Case study:Flood channel creation and reconnection between riverbed and its floodplain on Vezouze river

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Location: 48° 35' 39.25" N, 6° 29' 6.50" E

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management
Country	France
Main contact forename	Liliane
Main contact surname	Biton
Main contact user ID
Contact organisation	Communauté de communes du Lunévillois
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The Vezouze River has a pluvial regimen and its flow is rapidly affected by the rainfall. This cause a recurring flood, often violent on the urban area of Lunéville. Several factors upstream (natural flooding areas reduction) and downstream (bad drainage conditions) make the situation worse. Thus bank protection and riprap were put in place and the riverbed was regularly cleaned up. After the great flood in 2006, the Lunèville community undertook a global protection program in order to reduce flood risk, including expansion areas restoration. The restoration works include increase in riverbed width, removal of a protection bank on the left side, creation of two flood channels (one meter wide on average, on six hectares) with connected wetlands and revegetation of the riverbanks and the new channels. The results are really satisfactory, regarding both the ecological and hydraulic aspects; the water level and flooded areas were clearly reduced on Lunéville.

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Image gallery

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The Vezouze at Luneville before the restoration. The protection bank on the left side prevents the flood expansion in the floodplain.

The Vezouze floodplain during the works in July 2007: creation of a flood channel on the left bank.

The Vezouze floodplain six months after works in December 2007; the flood channel on the left bank

The Vezouze floodplain two years after works in May 2009; the flood channel on the left bank

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Rhin-Meuse River basin Subcatchment River name La Vezouze Area category Area (km2) Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Western Highlands Dominant land cover Agriculture Waterbody ID Site Edit site Name Lunéville WFD water body codes FRCR286 WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate River corridor land use Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 10001,000 m <br />1 km <br />100,000 cm <br /> Project started Works started 2007/05/01 Works completed 2007/08/01 Project completed Total cost category Total cost (k€) 19301,930 k€ <br />1,930,000 € <br /> Benefit to cost ratio Funding sources Direction régionale de l’environnement (DIREN) (20, 5 %), Agence de l’eau (34 %). Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design 5050 k€ <br />50,000 € <br /> agence de l’eau, DIREN Stakeholder engagement and communication Works and works supervision 17001,700 k€ <br />1,700,000 € <br /> Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Flood risk management Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Riverbank revegetation, Removal of bank reinforcements Floodplain / River corridor Floodplain reconnection, Creation of a flood expansion area Planform / Channel pattern Channel widening Other Surface drainage systems improved Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Quantity & dynamics of flow Yes Yes No No No Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative hydrography, topography and geology of site Yes No No No No Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Case study description by ONEMA (French National Agency for Water and Aquatic Environments) (in French) Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information